Portable self-drilling device



Oct. 30, 1962 M. J. HEIDER PORTABLE SELF-DRILLING DEVICE Filed Aug. 19,1960 3,060,769 PORTABLE SELF-DRILLING DEVICE Merle J. Heider, GilmoreCity, Iowa Filed Aug. 19, 1966, Ser. No. 50,697 V Claims. (Cl. 77-13)This invention relates to a hole drilling device and more particularlyto one that will accomplish the entire drilling phase without attentionfrom the user.

.Power drills are very old and usually are in the form of a drill pressor electric hand drill. In the case of the drill press, the operatormust apply continuous manual pressure on the hand lever to force thedrill bit point through the object being drilled. When the hand drill isused, the entire unit is manually forced in a direction toward the holebeing bored. Obviously, with either tool the pressure would vary betweenoperators, and furthermore, the pressure would not be uniform orconsistent throughout any one drilling operation. Such uneven anduncontrolled pressure on the bit may well bur-n its point and in anyevent, shorten its useful life. Furthermore, considerable labor andattention must be given to the drilling phase. A still further objectionto the present drilling equipment is that the object to be drilled mustbe manually held and stabilized during the drilling and this is oftendifficult and dangerous especially in the matter of small objects.

Therefore one of the principal objects of my invention is to provide ahole drilling device that will automatically exert forward pressure onthe drill bit without attention from the user.

A further object of this invention is to provide a drilling device thatgives uniform yieldable forward pressure to the bit.

A still further object of this invention is to provide a drilling devicethat has adjustable yieldable forward pressure on the drill bit.

A still further object of this invention is to provide an automaticdrilling device that securely holds the object against movement duringthe drilling phase.

A still further object of this invention is to provide a hole drillingmeans that drills a straight hole.

A still further object of this invention is to provide a hole drillingmeans that does not break the drill bits being used.

A still further object of this invention is to provide an automatic holedrilling device that is portable.

Still further objects of my invention are to provide an automatic holedrilling means that is economical in manufacture and durable in use.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangements, andcombination, of the various parts of the device, whereby the objectscontemplated are attained as hereinafter more fully set forth,specifically pointed out in my claims, and illustrated in theaccompanying drawings, in which:

FIG. 1 is a front perspective view of my device ready for use; and

FIG. 2 is a longitudinal sectional view of the device taken on line 2-2of FIG. 1, and more fully illustrates its construction.

As a part of my equipment I prefer to use an ordinary electric handdrill having the usual body housing 10, rear handle 11, switch trigger12, chuck 13, and forwardly extending drill bit 15. I use the numeral 16to designate the base portion of my device and which is in the form ofan elongated tube rectangular in cross section. The numeral 17designates an upwardly extending inverted U-shaped post jaw on theforward end of the base 16. The numeral 19 designates a bar, rectangularin cross 3,06%,759 Patented Oct. 30, 1962 section and slidable in thetubular base 16. This bar 19 extends forwardly of the base 16, and hason its forward end and beyond the post jaw 17, an upwardly extendinginverted U-shaped post jaw 20. The numeral 21 designates a threadedprojecting rod on the rear end of the bar '19, and which extends fromthe rear end of the base 16. The numeral 22 designates a nut threaded onthe rear area of the rod 21. This nut has radial handles 23 andoperatively bears on the rear end of the base -16 as shown in FIG. 2.The two jaw posts 17 and 20, each has its openings extendinglongitudinally of the base 16 for receiving the drill bit 15. When anobject, such as 25, is to be drilled it is placed between the two postjaws, as shown in FIG. 1, and the nut 22 rotated to the right, therebybringing the post jaw 20 rearwardly toward the post jaw 17, and thusrigidly clamping the object between the two post jaws. Slidable on thebase .16 is an outer tube sleeve 27 rectangular in cross section. Thenumeral 29 designates an upwardly extending inverted U-shaped post onthe forward end of the tube sleeve 27. On the rear end of the tubesleeve 27 is a vertical forwardly extending U-shaped bracket 30. Whensecuring the hand drill to my frame means, the handle 11 is placed inthe bracket 30 and the drill bit 15 and chuck 13 are extended throughthe inverted U-shaped post 29 :as shown in FIG. 1. The hand drill isrigidly held in place by a plate 26 at the rear of its handle which isengaged by a hand rod 28 threaded through the back of the bracket 30.

Extending horizontally from the bracket 3% is a shaft 31. Rotatablysecured to this shaft between its two ends is a hand lever 32. Near theupper end of the lever 32 is a hook peg 33. The numeral 35 designates achain length having its forward end secured to the post 29 and certainof its links selectively detachable in the hook peg 33. The numeral '36designates a lug on the forward end of the base 16. The numeral 37designates a coil spring having one end secured to the lower end of thelever 32 and its other end secured to the lug 36.

The practicable operation of the device is as follows: With the objectto be drilled secured between the two jaw posts, with the hand drillsecured in the frame, and with the chain detached from hook peg 33, thetube sleeve carrying the hand drill may be slid forwardly or rearwardlyon the base 16. By manually moving the upper end of the hand leverforwardly, the coil spring will yieldingly slide the tube sleeve andhand drill toward the object to be drilled. The further the hand leveris moved forwardly, the greater the coil spring will be extended andthus the greater will be the yieldable force for moving the hand drilltoward the object to be drilled. This adjustment of the tension of thecoil spring adjusts the relative forward pressure on the drill bit, andthis selected yieldable force continues throughout the drilling phase.After the proper pressure force has been selected, the appropriate linkof the chain is placed around the hook peg as shown in FIG. 1. With theelectric hand drill switch turned on, the drill will complete thedrilling operation automatically without further attention from theuser. After the hole has been drilled, the chain is unhooked, the drillslid rearward, and the drilled object removed. The coil spring willprovide adjustable uniform yieldable force for moving the drill bitforwardly. If the object to be drilled is rigidly supported, such as :abeam, the tightening of the two jaw posts thereon will detachablyrigidly secure my entire unit onto the beam, or like. My device willoperate in almost any position, i.e., upside down, right side up,vertically, or horizontally.

Some changes may be made in the construction and arrangement of myport-able self-drilling device without departing from the real spiritand purpose of my invention, and it is my intention to cover by myclaims, any

- 7 3 modified forms of structure or use of mechanical equivalents whichmay be reasonably included within their scope. 'Iclaim: 1. In a holedrilling device, a tubular base, a bar slidably mounted in said tubularbase, a post jaw on said tubular base, a post jaw on said bar, means formechanically sliding said bar in one direction relative to said tubu lar:base, a sleeve slidably embracing said tubular base, a power drill onsaid sleeve, a lever operatively hinged between its two ends to saidsleeve, means for adjustably connecting the upper free end area of saidlever to said sleeve against movement in at least one direction, and acoil spring having one end connected to said tubular base and its otherend connected to the lower free end of said lever.

2. In a hole drilling device, a tubular base rectangular in crosssection, a bar rectangular in cross section slidably mounted in saidtubular base, a post jaw on said tubular base, a post jaw on said bar,means for mechanically sliding said bar in one direction relative tosaid tubular 'base, a sleeve rectangular in cross section slidablyembracing said tubular base, a power drill on said sleeve, a leveroperatively hinged between its two ends to said sleeve, means foradjustably connecting the upper free end area of said lever to saidsleeve against movement in at least one direction, and a coil springhaving one end connected to said tubular base and its other endconnected to the lower free end of said lever.

3. In a hole drilling device, a tubular base, a bar slidably mounted insaid tubular base, an inverted U-shaped post jaw on said tubular base,an inverted U-shaped post jaw on said bar, means for mechanicallysliding said bar in one direction relative to said tubular base, asleeve slidably embracing said tubular base, a power drill on saidsleeve, a lever operatively hinged between its two ends to H 4 7 saidsleeve, means for adjust-ably connecting the upper free end area of saidlever to said sleeve against movement in at least one direction, and acoil spring having one end connected to said tubular base and its otherend connected to the lower free end of said lever.

4. In a hole drilling device, a tubular base, a bar slidably mounted insaid tubular base, a post jaw on said tubular base, a post jaw on saidbar, means for mechanically sliding said bar in one direction relativeto said tubular base, a sleeve slidably embracing said tubular base, apower drill on said sleeve, a lever operatively hinged between its twoends to said sle'eve, link chain means for adjustably connecting theupper free end area of said lever to said sleeve against movement in atleast one direction, and a coil spring having one end connected to saidtubular base-and its other end connected to the lower free end of saidlever. 1

5. In a hole drilling device, -a tubular base, a bar slidably mounted insaid tubularxbase, a post jaw on said tubular base, a post jaw on saidbar, threaded nut means for mechanically sliding said bar in onedirection rela tive to said tubular base, a sleeve slidably embracingsaid tubular base, a power drill on said sleeve, a lever operativelyhinged between its two ends to said sleeve, means for adjustablyconnecting the upper free end area of said lever to said sleeveagainst'movement in at least one direction, and a coil spring having oneend connected to said tubular base and its other end connected to thelower free end of said lever.

References Cited in the file of this patent UNITED STATES PATENTS766,976 Shek Aug. 9, 1904 2,737,065 Piersall Mar. 6, 1956 2,749,780Jones June 12, 1956 2,947,204 Pine et a1 Aug. 2, 1960

